"Search in current" via keys does not work

[cweiske]

Steps to reproduce:

1. open https://docs.typo3.org/p/brotkrueml/schema/3.11/en-us/Developer/Breadcrumb.html
2. Click "Search" on the top right
3. Enter "xmlns"
4. keyboard-selectable items will be shown automatically:
   1. xmlns (search all)
   2. manual: brotkrueml/schema version:3 xmlns (search in current)
   3. More search results ("open this page)
5. Use the "arrow down" key to select manual: brotkrueml/schema version:3 xmlns and press the "return" key
6. I'm redirected to the general search page (https://docs.typo3.org/search/search?q=xmlns) instead of the extension-specific one (https://docs.typo3.org/search/search?scope=%2Fp%2Fbrotkrueml%2Fschema%2F3.11%2Fen-us%2F&filters%5Bversion%5D%5B3%5D=true&q=xmlns)